Combined cover and base for a jar



FIG. 1 is a top view of a combined cover and base for a jar, embodying our new design;

FIG. 2 is a front elevation thereof, the rear and side elevations are the same; and,

FIG. 3 is a bottom view thereof.

The broken lines in the drawings are for illustrative purposes only and do not form part of the claimed design. 

The ornamental design for a combined cover and base for a jar, as shown and described. 